I unplug the expensive computers; engine, abs, aftermarket radio equipment. I'll also disconnect the battery. Anything close to the weld spot that is rubber I will lay a wet rag over. I also have a large fire-blanket for larger coverage (don't lay it on paint without a cloth under it though )

__________________
Brian C.
2004 4runner just starting to build
83 Hilux SR5 is being sold
94 pickup in a pile of parts

Second all of the above. Although I have never had a stereo worth worrying about, but the ECU gets unplugged, and battery disconnected.

And DOUBLE check the other side, as Randy say's.

Only other advice that I have is that, almost always (though not 100% of the time) electricity will take the shortest path. So, to eliminate issues with electronics in the vehicle, place your grounding clamp as close to your weld area as possible. This will reduce your risk of burning out any unplugged electronics.

in addition to the above, make sure there are no rotating parts or any joints between the ground and where you are doing your work. Like worst possible thing to do would be to say ground a lug nut to weld a frame.

Then you'd probably hose everything in between, like wheel bearings, when they all arc while you start the weld.

Good stuff, thanks! Maybe I'll stick to trailers for a while longer... much less prep!

edit: p.s. Randy, I'm getting better at your old welder, my last couple projects actually don't look half bad. I'm worse when I try to stick thin stuff to thick stuff, but when I can join two 3/16" pieces it's pretty sweet.. definitely having fun with this, my favorite sticks are the 6013's.

So far the camper has a new motorcycle carrier and upgraded battery holder, the utility trailer has a new battery holder, upgraded wheel pivot, and some new tie-down spots, my boy's motorcycle got a cut & turn on the handlebars to give him a little more reaching room, and my neighbors ATV plow got fixed this past winter. I think I'm most proud of the ATV plow. Not a bad winter of welding.

6013 is anice all around welding rod, easy to use for just about anything. You can get it in different rod sizes too. If you get the smaller diameter stuff it will make welding the thinner material easier.

You're on the slippery slope for sure, next on your list will be a mig unit

I've welded repeatedly to the Chili and others with no concern for the ECM. I would NOT disconnect the battery... it acts as a clamping device. Think, capacitor. Shunts spikes to some degree. We are dealing with low voltages, but much current/ inductance. Operate accordingly.

Ground very close to your work and make sure you know what is near the welding location. Do NOT drape welding cables over anything, induction is real.